IDY10220 SECURITE High Seas Forecast for Western METAREA 10 12S TO 30S BETWEEN 90E AND 125E, AND 30S TO 50S BETWEEN 80E AND 129E Issued by the Australian Government Bureau of Meteorology For 24 hours commencing 2300 UTC 18 September 2026 Part 1 Warnings Refer to latest warnings for boundary of affected area and type of weather system. Melbourne Storm Force Wind Warning 2. Melbourne Gale Warning 6. Melbourne Gale Warning 8. Melbourne Gale Warning 10. Melbourne Gale Warning 11. Melbourne Gale Warning 12. Part 2 Situation at 181800 UTC Low [1] 998hPa near 36S113E. Forecast trough [1] 35S117E to weakening low [1] 1000hPa near 38S118E to trough [1] 40S117E at 190300UTC, then trough [1] near 34S123E 37S125E 40S125E at 191200UTC, then decaying thereafter. Cold front [1] 39S090E 44S100E 50S107E. Forecast cold front [1] near 37S128E 41S134E 50S142E at 200000UTC. Forecast cold front [2] entering area from the west near 43S073E 47S077E 50S077E at 190000UTC, and near 38S091E 44S095E 50S096E at 200000UTC. Part 3 Forecast Refer to latest warnings for details of the area affected. South of line 38S080E 38S105E 31S111E 33S129E, outside warning areas: Westerly quarter winds, shifting southwesterly quarter within 540nm west of cold front [1] and 360nm west of cold front [2], shifting northwesterly quarter east of cold front [1] and within 360nm east of cold front [2]. Winds turning clockwise with 180nm of low, then southwesterly quarter within 240nm west of trough [1], and northwesterly quarter within 240nm east of trough [1]. Wind speeds 20/33 knots. Rough to very rough seas. Moderate to heavy swell. Remainder: Winds not exceeding 25 knots. Moderate to rough seas. Moderate to heavy swell, easing to low swell east of line 12S119E 19S117E. Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of fronts and trough, within 240nm of low and within 120nm of line 13S090E 18S100E. Visibility reducing below 2nm in precipitation. Please be aware Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger than the forecast, and stronger still in squalls and thunderstorms. Maximum waves can be twice the forecast height. WEATHER MELBOURNE The next routine forecast will be issued at 09:00 UTC Saturday.